Open epsi1on opened 2 years ago
Attached Files El mar, 29 mar 2022 a la(s) 14:14, epsi1on @.) escribió: … Newmark-beta method is used for finding the response of a structure with known stiffness, mass and damp matrix to external excitation like dynamic force and dynamic settlements (earthquake which vibrates the fixed DoFs). More info on wikipedia: Link https://en.wikipedia.org/wiki/Newmark-beta_method — Reply to this email directly, view it on GitHub <#127>, or unsubscribe https://github.com/notifications/unsubscribe-auth/AM3WCG22XYVWO2CMMNBDEJLVCM3BBANCNFSM5R7DAUZQ . You are receiving this because you are subscribed to this thread.Message ID: @.>
Hi @MLiranzo,
I cannot see any attached file.
@MLiranzo That is because you reply to the notification email directly. Please use this link 👍🏼 https://github.com/BriefFiniteElementNet/BriefFiniteElement.Net/issues/127
@MLiranzo Thanks for great detailed calculation. Can you please also write a simple code (10-15 lines of code) that makes your model? For your case there will be 8 nodes, and 9 elements.
Pretty much like this code which is from truss example:
private static void Example1()
{
Console.WriteLine("Example 1: Simple 3D truss with four members");
// Initiating Model, Nodes and Members
var model = new Model();
var n1 = new Node(1, 1, 0);
n1.Label = "n1";//Set a unique label for node
var n2 = new Node(-1, 1, 0) {Label = "n2"};//using object initializer for assigning Label
var n3 = new Node(1, -1, 0) {Label = "n3"};
var n4 = new Node(-1, -1, 0) {Label = "n4"};
var n5 = new Node(0, 0, 1) {Label = "n5"};
var e1 = new TrussElement2Node(n1, n5) {Label = "e1"};
var e2 = new TrussElement2Node(n2, n5) {Label = "e2"};
var e3 = new TrussElement2Node(n3, n5) {Label = "e3"};
var e4 = new TrussElement2Node(n4, n5) {Label = "e4"};
//Note: labels for all members should be unique, else you will receive InvalidLabelException when adding it to model
e1.A = e2.A = e3.A = e4.A = 9e-4;
e1.E = e2.E = e3.E = e4.E = 210e9;
model.Nodes.Add(n1, n2, n3, n4, n5);
model.Elements.Add(e1, e2, e3, e4);
//Applying restrains
n1.Constraints = n2.Constraints = n3.Constraints = n4.Constraints = Constraint.Fixed;
n5.Constraints = Constraint.RotationFixed;
//Applying load
var force = new Force(0, 1000, -1000, 0, 0, 0);
n5.Loads.Add(new NodalLoad(force));//adds a load with LoadCase of DefaultLoadCase to node loads
//Adds a NodalLoad with Default LoadCase
model.Solve();
var r1 = n1.GetSupportReaction();
var r2 = n2.GetSupportReaction();
var r3 = n3.GetSupportReaction();
var r4 = n4.GetSupportReaction();
var rt = r1 + r2 + r3 + r4;//shows the Fz=1000 and Fx=Fy=Mx=My=Mz=0.0
Console.WriteLine("Total reactions SUM :" + rt.ToString());
}
Thanks again
Newmark-beta method is used for finding the response of a structure with known stiffness, mass and damp matrix to external excitation like dynamic force and dynamic settlements (earthquake which vibrates the fixed DoFs).
More info on wikipedia: Link
Alternative method is central difference method, which can be better (need discussion)